A.M. and P.M.

Non-abbreviated form: Ante and Post Meridiem

What is Noon and Midnight?

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A.M. and P.M. start immediately after Midnight and Noon respectively.

This means that 00:00 A.M. or 00:00 P.M. (or 12:00 A.M. and 12:00 P.M.) have no meaning.

Every day starts precisely at midnight and A.M. starts immediately after that point in time e.g. 00:00:01 A.M. (see also leap seconds )

When scheduling around midnight, prefer to use either 23:59 or 00:01 to avoid confusion as to which day is being referred to.